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Dhaliwal, S.; Rybak, I.; Ellis, S.; Notay, M.; Trivedi, M.; Burney, W.; Vaughn, A.R.; Nguyen, M.; Reiter, P.; Bosanac, S.; Yan, H.; Foolad, N.; Sivamani, R.K. . (2018). Prospective, randomized, double-blind assessment of topical bakuchiol and retinol for facial photoaging. British Journal of Dermatology, (), –. doi:10.1111/bjd.16918 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research